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Your LimeSurvey version:  LimeSurvey Community Edition version 5.3.17+220525
Own server or LimeSurvey hosting: own server
Survey theme/template:
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I apologize in advance for the English translation.

After performing the settings according to the following page,
when I tried to log in with LDAP authentication, an image error appeared.
www.limesurvey.org/manual/LDAP_settings

 

With debug mode enabled I get the following error:

Fatal error: During inheritance of IteratorAggregate: Uncaught Error: Class "CList" not found in C:\Apache24\htdocs\limesurvey\framework\base\CComponent.php:474 Stack trace: #0 C:\Apache24\htdocs\limesurvey\framework\base\CComponent.php(516): CComponent->getEventHandlers('onbeginrequest') #1 C:\Apache24\htdocs\limesurvey\framework\web\CHttpRequest.php(146): CComponent->attachEventHandler('onBeginRequest', Array) #2 C:\Apache24\htdocs\limesurvey\application\core\LSHttpRequest.php(151): CHttpRequest->normalizeRequest() #3 C:\Apache24\htdocs\limesurvey\framework\web\CHttpRequest.php(119): LSHttpRequest->normalizeRequest() #4 C:\Apache24\htdocs\limesurvey\framework\base\CModule.php(394): CHttpRequest->init() #5 C:\Apache24\htdocs\limesurvey\framework\base\CModule.php(103): CModule->getComponent('request') #6 C:\Apache24\htdocs\limesurvey\framework\base\CErrorHandler.php(292): CModule->__get('request') #7 C:\Apache24\htdocs\limesurvey\framework\base\CErrorHandler.php(133): CErrorHandler->handleError(Object(CErrorEvent)) #8 C:\Apache24\htdocs\limesurvey\framework\base\CApplication.php(834): CErrorHandler->handle(Object(CErrorEvent)) #9 C:\Apache24\htdocs\limesurvey\framework\collections\CList.php(38): CApplication->handleError(8192, 'Return type of ...', 'C:\\Apache24\\htd...', 88) #10 C:\Apache24\htdocs\limesurvey\framework\YiiBase.php(437): include('C:\\Apache24\\htd...') #11 C:\Apache24\htdocs\limesurvey\framework\base\CComponent.php(474): YiiBase::autoload('CList') #12 C:\Apache24\htdocs\limesurvey\framework\base\CComponent.php(516): CComponent->getEventHandlers('onflush') #13 C:\Apache24\htdocs\limesurvey\framework\logging\CLogRouter.php(69): CComponent->attachEventHandler('onFlush', Array) #14 C:\Apache24\htdocs\limesurvey\framework\base\CModule.php(394): CLogRouter->init() #15 C:\Apache24\htdocs\limesurvey\framework\base\CModule.php(530): CModule->getComponent('log') #16 C:\Apache24\htdocs\limesurvey\framework\base\CApplication.php(168): CModule->preloadComponents() #17 C:\Apache24\htdocs\limesurvey\application\core\LSYii_Application.php(90): CApplication->__construct(Array) #18 C:\Apache24\htdocs\limesurvey\framework\YiiBase.php(132): LSYii_Application->__construct(Array) #19 C:\Apache24\htdocs\limesurvey\index.php(192): YiiBase::createApplication('LSYii_Applicati...', Array) #20 {main} in C:\Apache24\htdocs\limesurvey\framework\collections\CList.php on line 38